John loftus



(No Model!) J. LOFTUS. SAFETY VALVE.

N0. 446,782. Patented Feb. 17, 1891.

I, I M

UNITED STATES PATENT FFICE.

JOHN LOFTUS, OF ALBANY, NEl/V YORK, ASSIGNOR OF ONE-HALF TO EZRA V. SMITH, OF SAME PLACE.

SAFETY-VALVE.

SPECIFICATION forming part of Letters Patent No. 446,782, dated February 17, 1891.

Application filed September 3, 1890. Serial No. 364,339. (No model.)

To all whom it may concern: 7 This disk is'provided with an annular open- Be it known that I, JOHN LOFTUS, accitizen ing 7 and two upwardly-projecting flanges S,

of the United States, andaresidentof Albany, which form seats for the valve, hereinafter in the county of Albany and State of New described.

York, have invented certain new and useful 9 designates ribs which connect the inner Improvements in Safety-Valves; and I do and outer portion of the disk. hereby declare that the following is a full, The valve proper consists of an annular clear, and exact description of the invention, disk 10, somewhat smaller in diameter than such as will enable others skilled in the art to disk (5, and has two downwardly projecting 10 which it appertains to makeand use the same, annular flanges l2,forming seats which 00- reference being had to the accompanying incide and register with the flanges 8 of the drawings, which form a part of this specifidisk 6. It will thus be seen that there is a cation. central space 13 formed between the two My invention relates to improvements in disks and an annular space 14 between d1sk10 I 5 safety-valves for steam-boilers. and the casing. The disk 10 is provided with The object of the invention is to provide a a series of holes 11 at one side of the center simple and economical safety-valve which thereof, which open into the casing and also shall be very sensitive in its action, quickly communicate with the space 13. Upon the opening and closing under varying boilerupper side of the disk 10 are formed a series pressures. The construction is also such that of upwardly-projecting radial wings 15, which fluttering of the valve is prevented, thus renserve to steady and guide the valve in its dering its operation more uniform and eftimovement. cient. The numeral 16 designates a coiled spring,

. The invention consists in the novel conone end of which bears against a washer 17,

Y 2 5 struction and combination of parts hereinresting upon valve 10, while the other end after fully described, and specifically pointed bears against a washer interposed between out in the claims. a the spring and the end of a screw-rod 18, pass In the accompanying drawings,Figure 1 is ing through the end of the casing. This a central sectional view of asat'ety-valvc conscrew-rod serves to regulate the tension of 3 structed in accordance with my invention. the spring. 86 Fig. 2 is 'a plan view with the valve-casing The operation is as follows: The parts berernoved. Fig. 3 is a plan view of the valve. ing in proper position, the tension of the screw Fig. 4 is a plan view of valve with spring in is adjusted to the pressure at which it is deposition. sired the boiler shall blow off. Vhen the 35 Inthe-saiddrawings,the reference-numeral pressure exceeds the safety limit, or that to 1 designates the base of the valve, screwwhich the spring is adjusted, the valve 10 will threaded at 2 and provided with a central be lifted off its seat, allowing the steam to screw-threaded orifice 3 at its lower end, by escape through the annular opening in disk which it is connected with a steam-boiler. 10 into the steam-space 13. Steam will also 40 The numeral 4 designates the valve-casing escape through the space 14; into the casing. oscrew-threaded at its lower end to engage The steam-pressure in the space 13 will still with the corresponding threads in the base 1. further raise the valve, and thus relieve the The upper end of this casing is closed and boiler of excessive pressure. By providing provided with a number or series of perforathe escape-openings 11 at one side of the cen- .45 tions for the escape of the steam. ter of disk 10 there will be a greater pressure The base 1 near its upper end is provided at one side than at the other, causing the with an annular shoulder 5 to receive the valve to be tipped or tilted, so that the wings diskG, the rim of which is held between the 15 will bind slightly against the casing, and said shoulder and the bottom of the casing, thus prevent the valve from fluttering. hen

50 whereby it is securely retained in position. the steam-pressure has decreased until its l'oree is eounteraeted bv the eoiled spring, the valve will be l'oreed baek to'it (at and elosed.

ll will be seen that the easing aets as a mu filer, which obviates the disagreeable noise incident to blowing oil. The valve l laets as apist'on, and by reason of its construction, in eonneetion with the other parts, is very sensitive in its action quickly responding to variations in boiler-pressu re.

llaving thus described my invention, what I claim is 1. In a safety-valve, the combination, with the base and easing, 01. a disk having an annular opening and two upwardly-projeeting flanges on each side thereof 'torn'iing valveseats, the valve having corresponding downwardly-projeeting flanges eorrespondi 11;: with the flanges in the disk and having holes or openings at one side of the center and up \vardlyprojecting radial wings, a screw-rod passing through the end of the easing, and a coiled spring interposed between the valve and said rod, substantially as described.

L. in a safety-valve, the C(HIllJlIHLtlOll,\Vltll the base having, sermv-threaded upper end andan llllllllitlSllt)lll(l0l,tll(l easing; eonneeted with said base, closed at its top, and provided with a number of eseapeepenings, the disk havingannularopening,upwardly-projeeting annular llangesaind conneet'i lie-ribs, said disk being eontined between the shoulder in the base and the end ot the easing, of the valve having the annular downwardly-extending flanges seated upon the flanges ot the disk, aseries of holes at one side of the eentorthere- 0t and upwardly-projeetinu radial wings,the regulatingserew, the eoiled spring, and the washers againstwhieh the ends of the spring bear, substantially as described.

In testimon that I claim the foregoing as my own I have hereunto at'tixed my signature in presenee of two witnesses.

Wit nessesi:

'lincrrnv G. Ilavns, H. E. (DULY. 

